LIGO Document P1700127-v19

First low frequency Einstein@Home all-sky search for continuous gravitational waves in advanced LIGO data

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We report results of a deep all-sky search for periodic gravitational waves from isolated neutron
stars in data from the O1 LIGO science run. This search investigates the low frequency range
of advanced LIGO data, between 20 and 100 Hz, much of which was not explored in initial
LIGO. The search was possible thanks to the computing power provided by the volunteers of the
Einstein@Home distributed computing project. We find no significant signal candidate and set the
most stringent upper limits to date on the amplitude of gravitational wave signals from the target
population, corresponding to a sensitivity depth of 48.7 [1/ Hz]. At the frequency of best strain sensitivity, at 100Hz, we set a 90% confidence upper limit of 1.810−25, while at the low end of our frequency range, 20 Hz, we achieve upper limits 3.9 10−24. At 55 Hz we can exclude sources with ellipticities greater than 10−5 within 100 pc of Earth with fiducial value of the principal moment of inertia of 1038kg m2.
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Phys Rev D

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